Investigation On Shear Behavior Of RC Walls With Concealed Vertical Slits

RC walls with concealed vertical slits(CVSW for short)is an excellent component that can take into account the bearing capacity,lateral stiffness and deformation capacity,and has wide application prospects in earthquake-resistant areas.At present,the research group has carried out the experimental research of partially-restrained steel frame with concealed vertical slits RC infill wall,but there has not been a separate study on the RC wall panels with concealed vertical slits.Based on this,through systematic experiments,numerical simulations and theoretical analysis,the systematic study of the shear mechanism of the RC wall panels with concealed vertical slits is carried out,and the following work is mainly completed:(1)Three single-layer,single-span 1/3-reduced CVSW specimens were designed and produced,and conducted low-cycle repeated loading tests,based on the test to focus on the inspection of the wall panel opening form and the height-to-width ratio of the wall between the slits for the impact of CVSW hysteretic behavior,shear capacity,stiffness degradation,ductility,energy dissipation capacity,etc.;(2)Based on the ABAQUS software,a nonlinear finite element model was established for three CVSW specimens,and the rationality of the finite element model was verified by comparing the simulation with the test results;(3)24 CVSW panel in 9 series were designed,and conducted parametric simulation analysis through finite element software,focusing on the design parameters such as wall thickness,concrete strength,thickness of concealed vertical slits,and height-to-width ratio of the wall between the slits to the overall performance impact of CVSW panel;(4)Based on the analysis of finite element parameters,the formula of lateral rigidity and shear capacity of the RC wall panels with concealed vertical slits is proposed,and compared with the results of the calculation examples to verify the accuracy of the formula.